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图1所示铜套是气动油泵中的换向控制元件,阀杆在其内部运动,控制气动油泵的往复动作。铜套与阀杆之间靠间隙密封,因而对铜套内孔的精度要求非常高。
The copper sleeve shown in Fig. 1 is a reversing control element in the pneumatic oil pump. The valve stem moves in its interior to control the reciprocating motion of the pneumatic oil pump. Copper sleeve and stem by the gap between the seal, so the accuracy of the copper sleeve hole is very high.